In case you were planning an experiment where the OML server is located somewhere else you would have to modify this line accordingly.

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You have to assure that the omluri is reachable from ALL nodes that participate in your experiment. This does not necessarily mean that the OML server has a public IP address. E.g., in the case of an experiment on an ExoGENI slice, the OML server can be located on one of the nodes of this slice.